ppm to mg/m³ Conversion

ppm to mg/m³ Conversion

CH-03
ASPCSPFoundational

Formula
mg/m³ = (ppm × MW) ÷ 24.45
When to Use

Convert airborne concentration from parts per million to milligrams per cubic meter. Required for comparing to mg/m³-based TLVs.

Symbol Legend
SymbolMeaningUnitNote
mg/m³Milligrams of contaminant per cubic metermg/m³
ppmParts per million of contaminantppm
MWMolecular weight of contaminantg/mol
24.45Molar volume of gas at NTPL/mol25°C and 1 atm

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